Manufacture of artificial stone, cement, or the like



'. UUMtUSIlIUNS,

COATING OR PLASTIC.

qg Patented May 29, 1923.

UNITED STATES PATENT OFFICE.

No Drawing.

like.

According to the invention siliceous mat- HOWARD BERRY, OF WELWYN, ENGLAND.

Application filed February 14, 1923. Serial No. 619,011.

may be adopted:

n or na e. rate or n1 ra e Mug, a race say, 43%? The above materials may be powdered separately, before mixture, but are prefer- MANUFACTURE OF ARTIFICIAL STONE, CEMENT, OR THE LIKE.

As an example, the following proportions zggdgngg slate or other basic material as above speci e Calcined magnesite or ma nesium oxide, m

I! i-ot, 5%.

' oxide. chloride hyably powdered together. The powdered product is then mixed with water and apter such as waste slate, coal shale. granite, plied as a cement or plaster, or is moulded.

16 broken bri umhs ca e. o

20 xicari.

ates and hydrates of a nnlonlum. or mix ures 0 an 5 some instances about 1% to 2% of soluble uar z flint m ma Brougli into a comminuted state by crushing or powdering is mixed with ma nesium oxide. and either with tarsilicate ma Bonates, blcarbonates or hydrates, or the finished product may be soaked in a solution of soluble silicate.

When hydrates are used, they are preferably formed into solutions before addition to the other ingredients.

In order-to hasten the hardening of the artificial stoneor-oenW rium and or strontium salts with or wltli- 3 out a "mmnum-ea suc as the chloride,

sulphate or phosphate is added to'tlifiiiixture and a tra'c'o'f'wsoluble magnesium salt may be added preferably magnesium sulphate.

l8 carbonates bicarbon- SOlillllTl. )OEaSSl I o tiese.

the mlxture.

I claim race of ba- VVhen ma nesium sul hate is added it may form .mm...

It is preferred to use magnesite which has been burnt or calcined in an atmosphere of steam or water vapour at a low temperature, for instance between 300 to 600 C. Any distillate passing over from the calcinn ing process may be collected and added to it may be 115mm Sula-ting composition for covering boilers, pipes and the like.

A oementitious material composed of 85% powdered slate, 10% calcined magnesite, 5% sodium bicarbonate, mixed with a trace of a soluble barium compound, substantially as hereinbefore set forth.

In testimony whereof I have signed my name to this specification.

HOWARD BERRY.

Wllllllla? 

